Weightlifing
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29.WEIGHTLIFING
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Olympic Games 1920–1972
In 1920, weightlifting returned to the Olympics and, for the first time, as an event in its own right – and weightlifting has been contested at every (summer) Olympics Games since. The 1920 Games took place at Antwerp in Belgium; and fourteen nations competed. The competition lifts were the 'one hand' snatch, the 'one hand' clean and jerk and the 'two hands' clean and jerk. At the next Olympic Games, in Paris, in 1924, the 'two hands' press and the 'two hands' snatch were added to the program, making a total of five lifts; and weight classes were introduced for competitors, with weightlifters competing in five weight divisions. The 110 kg division weightlifting winners at the 1980 Summer Olympics, held in Moscow In 1928, the sport dropped the 'one hand' exercises, going forward with three 'two hand' exercises: the snatch, the clean and press, and the clean and jerk. The 1972 Olympics was the last Olympics featuring the clean and press, as difficulties in judging proper form led to it being dropped from subsequent competitions. Athletes, rather than "strictly" pressing the weight overhead with an upright torso, had been using their hips and leaning backward substantially. Some athletes were able to initiate the press with a hip thrust so rapid that judges found it difficult to determine whether or not they had utilized any knee bend to generate additional force, something strictly prohibited in the rules. Also prohibited was "excessive layback" (leaning back too much), but it was considered too difficult to determine what degree of layback constituted a rule violation. As a result, the clean and press was discontinued as a competition lift after 1972. 1973–present
In 2011, the International Weightlifting Federation (IWF) ruled that athletes could wear a full body "unitard" under the customary weightlifting uniform.[18] Kulsoom Abdullah became the first woman to do so at the U.S. National Championships that year, and athletes are allowed to do so at the Olympics.[18] IWF rules previously stated that an athlete's knees and elbows must be visible so officials can determine if a lift is correctly executed.[18] Equipment
Knurling on an Olympic barbell Olympic weightlifting uses a steel bar (also known as a barbell) with larger-diameter rotating sleeves on either end, holding rubber-coated weight plates of different weights. This sleeve rotation is important for the Olympic lifts, particularly the snatch and clean movements, because it drastically reduces the rotational inertia of the bar. Without sleeve rotation, the Olympic lifter faces more challenging lifts and a greater risk of injury.[19] A men's Olympic barbell weighs 20 kg (44 lbs) with a shaft diameter of 28 mm and a length of 2200 mm, whereas a women's Olympic barbell weighs 15 kg (33 lbs) and has a shaft diameter of 25 mm with a length of 2010 mm.[20][21] The distance between the sleeves, however, is the same for the men's and the women's bars at 1310 mm. The grip texture of the bar is called the knurling, and is distributed differently between the men's and women's bars: the men's has knurling in the center but the women's does not. The Olympic barbells used in competition are certified by the IWF.[19] Bumper plates
Competition iron plates In addition to the rubber bumpers, smaller competition iron plates can be used to add weight in small increments to the bar. The color designations for these iron plates are as follows: 1 kg is green, 1.5 kg is yellow, 2 kg is blue, 2.5 kg is red, 5 kg and 0.5 kg are white. It is useful to note the color assignment of these iron plates is consistent with the heavier bumper plates (i.e. 1 kg and 10 kg are green, 1.5 kg and 15 kg are yellow, etc.).[19] Collars
An Olympic lifter, Jang Mi-ran, holding a barbell loaded with red 25 kg bumper plates, held in place with a collar. Note the lifter's taped wrists and thumbs, her weightlifting shoes, and her weightlifting belt. Weight plates are secured to the bar using collars on each sleeve that weigh exactly 2.5 kg each. Singlet
Belt
Chalk
Tape
Olympic lifters also tape their wrists, preventing exaggerated and uncomfortable joint movement during lifts. For particularly heavy overhead lifts, a taped wrist enables the lifter to regulate wrist extension and delimit the translation of the radius and ulna distal heads. However, while taped wrists can prevent wrist and forearm injuries in the short-term, excessive use can lead to weakened connective tissue in the area, increasing the risk of pain and injury.[19] Shoes The type of shoes worn by Olympic weightlifters is perhaps their most distinctive piece of equipment. Weightlifting shoes are typically designed with a raised heel of 0.5" to 1.5" and one or two metatarsal straps that tighten across the instep of the shoe. The raised heel helps the lifter maintain an upright torso while catching the bar and also allows for a deeper squat under the bar. The soles of the shoes are also quite rigid, helping to resist compression while under heavy loads. The shoes are designed for maximum stability while remaining flexible in the toe box. This allows the lifter to come up on the toes and to catch the weight on the ball of the back foot during the "jerk" movement of the lift.[19] There are also different heel constructions. Most modern Weightlifting shoes use a hard TPU plastic heel that does not deform and is more durable than other materials. However, there has been a resurgence in premium shoes using retro wood heels which are hard but do not last as long. Download 23.09 Kb. Do'stlaringiz bilan baham: |
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